The post you are replying to was a follow up from my earlier post on installing KB937287 and KB938371. The original post was as follows:
Having failed 3 times to install KB938371 I succesfully did the following
Go to Download details: Download details: Update for Windows Vista (KB937287)
Update for Windows Vista (KB938371)
Download standalones KB937287-x86.msu and KB938371-x86.msu
Disable UAC, Anti-virus, Windows firewall and disconnect from internet
Install KB937287 (no reboot required) then KB938371 reboot and it succesfully installs without multi bootups.
If you have installed KB937287 OK then follow the above disables instructions before installing KB938371 standalone and rebooting.
Your post is misleading with the quote that KB938727 cannot be uninstalled. Where does this update come in to play unless it is a typo?
If you go to the uninstall update page on your machine you should see the list of updates that can be uninstalled and on my machine both KB937287 and KB938371 are in the list.
Most replies I have had the above has worked OK.